|Have you chosen the correct label from the wizard?|
Even if you have, different printers - or even different printer trays - might print the data in slightly different places even with the same label choice.
The standard practice is to print your "labels" on a regular sheet of paper and hold it up to a light behind a sheet of labels. That way you can see if the labels will print correctly without wasting label stock. Keep adjusting the margins in the label wizard and/or page setup until they line up.